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There are already some rate my pic / hot or not type modules for xoops,
My Album-P which lets users post into and rate photos from an album
Hot Or Not Forum thread on the hot or not module for xoops
Hot Or Not Demo Site where the Hot Or Not module is running on a XOOPS site.
Dont ask me where the module is for download as I've not seen it available for download anywhere. If you find it let us know, it would be good to have it in the download section.